Zannis77: They're not so good, and they're not so old.
Please stop wasting resources on bad games that aren't even half a decade old yet.
Who died and made you king?
You don't seem to grasp the finer points of business. You can't just sell other people's products without their permission. GOG cannot simply start selling whatever games they want. They need to have a contract with whoever holds the rights to a game, granting them a license to sell that game in particular, before they can even start working on it. Thus, GOG are limited by which games the rights holders are permitting them to sell.
I guarantee you, they are still going after older games as much as possible, but the problem is that the older a game is, the more convoluted the rights to it tend to be. The original developer is probably defunct, the original publisher may have been bought by other companies several times over the years, or may have gone bankrupt and had it's assets auctioned off. Sometimes the rights to various parts of the game (graphics, music, publishing rights) are spread out between several different entities, requiring an agreement with all of them in order to actually sell the game. And some rights are simply in limbo, with noone really knowing who actually owns them.
So get off your high horse and try to be a bit constructive instead.